Air-regulator for ventilators or heaters



P. SHERWEN. AIR REGULATOR FOR VENTILATORS OR HEATERS.

APPLICATION FILED MAR. 27. I919- Patented June 8, 1920.

Emma-a Peter SZem en STATES PATENT @TMQE.

PETER SHERWEN, OF VANCOUVER, BRITISH COLUMBIA, CANADA, ASSIGNOR OF ONE-HALF TO I-IOLTON EVANS SANDS, OF VANCOUVER, BRITISH COLUMBIA,

CANADA.

AIR-REGULATOR FOR VENTILATORS 0R HEATERS.

isiaica.

Application filed March 27, 1919.

To all whom it may concern:

Be it known that 1, PETER SI-IERWEN, a subject of the King of Great Britain, and a resident of the city of Vancouver, in the Province of British Columbia, Canada, have invented certain new and useful Improvements in Air-Regulators for Ventilators or Heaters, of which the following is a specification. I

My invention relates to improvements in air regulators, and the object of my invention is to provide a simple and sensitive device capable of being embodied with a ventilating, or heater airreceiving pipe and adapted to be automatically operated by abnormal air current so as to regulate and maintain a normal steady flow of air through the pipe.

I attain this object by the construction illustrated in the accompanying drawings in which Figure 1 is a side View showing the device installed in a pipe.

Fig. 2 is an end view showing the air door.

Fig. 3 is an end view showing the shutter.

Fig. 1 is a face View of the air motor.

Similar figures of reference indicate simi lar parts throughout the several views.

1 indicates a ventilating pipe in which is rotatably mounted an air motor 2 of any approved construction, preferably'that illustrated in Fig. 1, in which three concentric rows of vanes 3, 1, 5 are shown, it being found that this construction renders the air motor very sensitive and quick acting. However, any number of vanes may be employed, and these may be solid, although it is desirable to perforate them with a number of tapering holes, as indicated at 6, the mouth of the holes facing the direction from which the air flows, The air motor is mounted on a shaft 7, rotatably mounted in bearings 8 and 9, and to this shaft is secured one end of a flexible cord 10 of any suitable material. 7

Secured to the pipe in the interior thereof at a suitable distance from the air motor 2 is a plate 11 provided with a number of apertures 12, the remaining solid portions 13 of the plate being each equal in size to the respective apertures, which plate forms an air door through the apertures 12 of which air may pass when the apertures are Specification of Letters Patent.

Patented June 8, 1920..

Serial No. 285,482.

open. Rotatably mounted on the front face of the door is a plate 14: forming a shutter for the door, which plate is a duplicate of plate 11, that is, it has the same number of apertures and solid portions, indicated by the numerals 15 and 16, as the door, so that the apertures 12 may be opened or closed by the rotation of the shutter 14.

17 indicates a weight secured to the shutter, to which weight is connected, after passing over a rotatable sheave 18, the opposite end of the cord 10, hereinbefore mentioned.

The manner in which the device operates is briefly as follows :-The incoming air revolves the air motor 2 and the shaft 7 around which the cord 10 then winds, thus turning the shutter 14 so that the solid portions 16 partially cover the apertures 12 in the door, thus reducing the an passage therethrough until the power on the air motor is balanced by the weight of the weight 17 the amount of turning movement of the shutter and closure of the apertures 12 depending on the pressure of the incoming air on the air motor. On the air pressure decreasing the force on the air motor becomes less than the weight of weight 17, which then turns the shutter by gravity in the opposite direction, uncovering the apertures 12, until the air pressure is again balanced by the weight 17, from which it will be seen that the flow of air through the air door is automatically regulated in a simple manner.

What I claim as my invention is:

1. In a device of the character described, the combination with an air pipe, of an apertured door mounted within the pipe through which the air flows, a shutter rotatably mounted on the face of said door adapted to open or close the door apertures, a rotatably mounted shaft, an'air motor mounted thereon and normally stationary when the velocity of air flow is normal, said air motor being provided with two or more concentric rows of vanes and said vanes being perforated with tapering apertures the mouths of which face the direction of the air flow, a flexible connection between said shaft and said shutter, said connection being adapted to wind on said shaft as the same is rotated by the operation of the air motor through increased velocity of air flow and move the shutter to partially close said apertures, and a Weight secured to said shut tor for returning the same to normal position as the air flOW velocity decreases and adapted to secure balanced operation of the same when opening or closing the door apertures. V V

2. The combination with an air pipe of a plate mounted transversely Within the pipe and provided with openings through which the air may pass, a door member rotatably engaged with one face of said plate to cover and uncover said openings, a shaft mounted Within the pipe and extending longitudinally thereof, an air motor mounted on said shaft, a pulley mounted in the pipe PETER SHERWEN. 

